The truth about the afc hack!!!!!!!
 

First off i don't really get this afc hack concept. Is there someone who can please explain this too me. Also i have heard that it advances your timing a whole bunch. How do you correct this, if you can? I have a d16z6 and want to boost it to about 10psi will this work with 450cc injectors and and afc. Also i heard that there is something called the missing link that is involved with this setup. What is a missing link. If someone could just explain to me how an afc setup works in full detail and considering that i am retarded and don't know all those high tech words that would be great.

Sorry for all the questions. I have read about a dozen post i just don't understand how this system works. Thanks for all your help.

Re:The truth about the afc hack!!!!!!!
 

I think we need a sticky about this subject, huh? *hint hint* ;)


You can run up to about 10-11 psi with the S-AFC hack. It reduces the voltage coming from the map and doesn't sense boost up to 10-11 psi. Yes it will advance your timing. You can either retard your initial timing a bunch, or get a BTM and retard it a little. You should not need a mising link with this setup unless you are planning on exceeding 10-11 psi although I have had cels once in a while. There are so many posts just like this one its rediculous. If you search around you will find everything you ever needed to know in this site.
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Re:The truth about the afc hack!!!!!!!
 

Yes i know that there are tons posts about this topic but what i am looking for is something like a Afc for dummies. I don't understand what you said by Map and btm. I am i just retarded and everyone else knows what a map is and a btm or am i not the only one?

Re:The truth about the afc hack!!!!!!!
 

A BTM stands for Boost timing master. It retards your timing a set amount per pund of boost. For instance it could retard your timing 1 degree per pound. AS for Map sensor that is what your ECU(computer) reads for management of the engine. The afc from my understanding actually is telling the ECU to run the injectors REAL lean but since the injectors are not stock anymore(much bigger 450's) your engine is not running lean at all. I guess the best analogy i can think of is if you were going to blow up something and you are used to using low level explosives and somone(the afc) tells you to use only a tiny bit(run lean). He has replaced your explosive material with C4 and therefore a tiny bit is enough. HMT guys correct me if i am wrong but that is how i understand it.

Re:The truth about the afc hack!!!!!!!
 

fuk all the bull ---- the afc works! can run my ---- all the way to 12psi on a sotck d16a6 and no map light! just retard the timeing at the distrutor and thats it. fuk that

Re:The truth about the afc hack!!!!!!!
 

Very good. You act like you don't know what you are talking about when you actually do.

You are very lucky to be not getting cels at 12 psi. Are you using a missing link as well?
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Re:The truth about the afc hack!!!!!!!
 

nope no missing link. it just works man. but anything past 12 give me a cel. i think 12 is the limit

Re:The truth about the afc hack!!!!!!!
 

How do you adjust the timing with the distrubutor?

Re:The truth about the afc hack!!!!!!!
 

Sticky? Done.

The stock Honda MAP sensor cannot sense beyond 9.25 psi 85-91, or 10.65 psi 92+. Understand that if you run right at the borderline, boost creep/spike might own you. If you run 12 psi... hope it isn't daily! I'd run that if I knew I was rich for a timeslip, or for a little fun, but there's too much chance of something going wrong if you drive daily like that.

Keehnel1414, you should pick up a factory service manual, a Helms, if you need to know something like how to adjust your base timing at the distributor. What car do you have? I may be able to provide your service literature in .pdf format.

Re:The truth about the afc hack!!!!!!!
 

1993 civic hatchback si. Thanks for the help and where can i get a helms manual? Also does the afc advance your timing through redline? If i correct this by retarding the timing with the distributor will the afc counter back and just advance the timing agian.

Re:The truth about the afc hack!!!!!!!
 

DR.Boost i had been trying to tell you from the beginning that i knew my stuff. I was only unclear about the timing advance before boost. Joseph has cleared that up. The BTM as i thought is not good enough really. I am probably not boosting my accord anymore now because this is too ricky for a 99 accord still under waranty with 70k miles. :( I will be buying a crx or hatchback instead.

Re:The truth about the afc hack!!!!!!!
 

Can you please explain to me what all this means. I am really retarded and have no clue about what you said here. Thank you for all the help maybe this will clear up some things for other people too.

Re:The truth about the afc hack!!!!!!!
 

Re:The truth about the afc hack!!!!!!!
 

If you still dont understand after they have clearly explained it, you need to learn the basics of your car(i.e changeing the oil.) Go to your nearest auto store and buy a manual, autozone checker napa, places like that. READ MORE POSTS!!!

Re:The truth about the afc hack!!!!!!!
 

please dont post gay stuff like that Turbodelsol. Not sure why you wan to dis a HMT member but it is pretty stupid of you plus as you can see most people in this thread know how the hack works.

Re:The truth about the afc hack!!!!!!!
 

i understand the basics of the afc hack. I just don't think that everyone has a clear idea about all of the afc system. i just wanted to clear things up. Also thanks for the back up Last_Mohican.

Re:The truth about the afc hack!!!!!!!
 

I'll explain this as good as I can. Since you said you were planning on running 10 psi and you are getting 450cc DSM injectors and plan on running the S-AFC, you will be fine. You would be running the same setup I have and it works great. You will not need a missing link. The missing link is basicaly a one way valve that mounts inbetween the map sensor and the throttle body. It prevents the map sensor from seeing boost and setting off the cel(check engine light). Lets say the map sensor normaly reads voltage from .50 volts-5.0 volts on a naturally aspirated engine. .50 volts being at idle and 5.0 volts being wide open throttle. When you add boost to the intake, the map sensor will be getting lets say 1.0 volts per pound of boost. The ecu sees the voltage as being too high and sends a cel. With the AFC hack you are taking the signal from the map sensor and lowering the voltage to compensate for the large injectors which in turn tricks the ecu into thinking it is supplying the stock injectors with the proper ammount of fuel. Therefore your ecu will not sence boost because the voltage has been "hacked" to fool the ecu into thinking everything is ok.
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Re:The truth about the afc hack!!!!!!!
 

OK I think everyone understands the deal with the lower map voltage but can someone say something about the timing curve when using the hack on/off boost? please?

Re:The truth about the afc hack!!!!!!!
 

That clears up alot of things for me. Thanks Mr. Dr. Boost. i was also wondering about what 2000psi said too. Thanks for all the help. I don't know what i would do without this site.

Re:The truth about the afc hack!!!!!!!
 

I'm not real sure about the exact advance the AFC adds. I'm sure Joseph knows though. All I know is it does advance it quite a bit. We'll have to wait for Joseph to answer this one..................
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Re:The truth about the afc hack!!!!!!!
 

OK how bout the Apexi ITC??? would that work to correct the timing at low boost?

Re:The truth about the afc hack!!!!!!!
 

Dr. Boost's summary about the MAP sensor being a 0 to 50 volt sensor is correct. The Honda MAP sensors are on a scale where 5 volts = 11.8 psi BUT they will never read that high. There is a diaphragm inside that stops travelling after 9.25 psi for OBD0 and 10.65 psi for OBD1/2 - they never reach the full 5 volts.

As for the ignition map situation... looky here. The pressure gradings across the top are for a naturally aspirated map, since Ghettodyne does not support my MAPhack setup. This is a stock OBD0 LS ignition map shown.

http://www.redpepperracing.com/galle...lbun85/abi.jpg


Just to give you an idea of what a stock OBD0 LS ignition map with 1.0 degree per psi retard looks like... see the difference?

http://www.redpepperracing.com/galle...lbun85/abl.jpg

Re:The truth about the afc hack!!!!!!!
 

Have any of you ever read this "trailer park boost" artical?
http://www.carolinahondas.com/forums...&highlight=AFC

Re:The truth about the afc hack!!!!!!!
 

Yes, it's complete crap.

Re:The truth about the afc hack!!!!!!!
 

Thanks for the info Joseph!!! we all appreciate it!! alright enough ass kissing...I've never used Ghettodyne and I don't understand some of the chart. Is the dark green area the safe zone or does color have nothing to do with it? do you read the columns or the rows? For instance, do you go to your desired vac/press quantity then scroll down the column to see what the timing is set at? So you're saying between 11in Hg and 1inHg is where the AFC hack falls short? Thanks man I think we're getting close to a conclusion here. Any info on the Apexi ITC helping to fix this?

Re:The truth about the afc hack!!!!!!!
 

why is the carolina hondas, trailer park setup complete crap?

Re:The truth about the afc hack!!!!!!!
 

Nice captions....hehehe

Re:The truth about the afc hack!!!!!!!
 

Ghettodyne is set up for naturally aspirated use, with engine RPM down the left side and engine vacuum (pressure via MAP sensor) across the top. It does not reflect the REAL values of the columns when used with an AFC hack.

With the AFC hack: 11 in/hg becomes 0.8 psi, 9 in/hg becomes 2.4 psi, 8 in/hg becomes 3.3 psi, 4 in/hg becomes 6.5 psi, 1 in/hg becomes 9.0 psi, and 1.3 psi becomes 11.8 psi. The last column is never used in an AFC hacked vehicle due to the limitations of the MAP sensor. If you dial the fuel rich enough toward redline, you change the MAP points and can actually bring the last column into play - or exceed it, like when you kick a code 3 with the AFC because you've richened beyond what the ECU can handle (over 3 volts returned from the MAP)


As far as my sarcastic comment regarding the MAPhack black box... I built it, I can give you a dozen reasons why it's POS. Atlee's had a few problems with voltage skewing around and tune changing a bit with temp and humidity on his car, which I don't like. The alternator increases voltage slightly (13.5 v to 14.5 v usually) as you rev the engine from idle which causes a little fluctuation (towards running rich) as you step on the gas... which I don't mind... but it's proven a bit unreliable.

Really, just pick up an electronics catalog and look for "voltage regulators." The part you want is a "7803" which is a 3 volt positive voltage regulator. It has three pins and is impossible to miswire - power in, 3 volts out, and ground. It holds the MAP sensor input at a rock solid 3.0x volts.

Re:The truth about the afc hack!!!!!!!
 

I still have a doubt about timing.........

If I go extremely rich to move to the next column, my air/fuel ratio will go far above 12:1 (losing power), wont it?


Another doubt is, IF i am boosting to only 6 or 7 psi, I wont even get to the final column unless I go with a -20 setting on the vafc.........which in turn will be too rich I think.........


I am starting to build the car during this weak and I am TOTALLY FREAKED OUT! I dont wanna blow! I planned on boosting to 8 psi and retarding static ignition (and pray....)

Re:The truth about the afc hack!!!!!!!
 

I just turned my boost up today to 11 psi. I have my ignition timing almost all the way retarded. It is just perfect. Absolutely no signs of detonation and just a smooth crazy power band all the way to 11 psi. I think you are worrying too much. Although, I have heard that running between 5-6 psi with the hack is not good. If you go with 8 psi you should be fine. I beat the hell out of may car at anywhere from 8-11 psi and I haven't blown my ---- yet.*knocks on wood*.
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Re:The truth about the afc hack!!!!!!!
 

Are you by chance pinging in low throttle dr. boost? :)

Re:The truth about the afc hack!!!!!!!
 

ok, who is running the afc hack without an itc or a btm? how much degrees should i retard the timing from the distro?

Re:The truth about the afc hack!!!!!!!
 

Nope, none at all anywhere. Perfect power all through the rpm.


I don't have a BTM and I have my timing almost as retarded as it will go. I am going to try and advance it a little and see what happens.
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Re:The truth about the afc hack!!!!!!!
 

Will the engine light flash if the boost is below 9.25 psi in my Civic? I mean, does the stock ECU handle the boost up to 9.25 psi and delivers the fuel needed?

Re:The truth about the afc hack!!!!!!!
 

Dr boost Can you tell us what your setup is and are you running a missing link or check valves?

Re:The truth about the afc hack!!!!!!!
 

If the boost is below 9.25 psi? Do you mean above? The stock ecu WILL NOT compensate for fuel under boost. You need some sort of fuel amnagement.


T-3 Super 60 at 8-11 psi (depending on how I feel)
Spearco fmic
DSM 450cc injectors
S-AFC
No missing link or check valves
timing is almost fully retarded at the distributor
No BTM

This seems to work just fine. I can't hear any pinging at all. Its just smooth and clean.
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Re:The truth about the afc hack!!!!!!!
 

on what engine?

Re:The truth about the afc hack!!!!!!!
 

D15B7 with a stock bottom end and a :-XBLOCKGUARD :-X which I would not recommend.
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Re:The truth about the afc hack!!!!!!!
 

The limitation of the MAP sensor (9.25 psi) has nothing to do with if you tune your AFC so that the MAP signal going to the ECU exceeds 3 volts.

Look at my ignition boost maps above... that's set for -40% across the board. If you start richening via AFC to around -35% (or richer) you've unstretched the maps enough to run off of them if you boost high enough.

Re:The truth about the afc hack!!!!!!!
 

No, i mean below 9.25 psi, I don't want to kill my engine ;) I understand that the ECU won't give my engine any more fuel if the boost is above 9.25 psi, but what if the boost is 0-9.25 psi?